Convert a series of PNGs to an animated gif or video file

Question

In Android Studio, I can click "Run" button in IDE to run an app, the app is running under debug model, but how can I know there is a debug model programatically? just like the following code.

If (IsDebug()){
   Toast.makeText(getApplicationContext(), "This is in debug, it will diplay some prompt information",Toast.LENGTH_LONG).show();
}else{
   Toast.makeText(getApplicationContext(), "This is release edition, it will not diplay debug information",Toast.LENGTH_LONG).show();
}

Solution 1

If you want to convert an image sequence into an animated .gif, the easiest way is via ImageMagick's convert command:

convert -delay 5 -layers Optimize $FILE_LIST foo.gif

The above command combines all of the files into an optimized animated .gif with a 5 millisecond frame time. You can also do more complicated things with timing via something like:

convert -layers Optimize -delay 5 frame1.png frame2.png -delay 10 frame3.png animation.gif

which gives a 5ms delay for frame1 and frame2, and a 10ms delay for frame3.

Solution 2

If you're concerned about quality, don't convert to GIF.

To create a video, you can use ffmpeg:

ffmpeg -f image2 -i 'image%d.png' -vcodec copy out.mkv

-f image2 -i 'image%d.png' tells ffmpeg to read the PNG images image1.png, image2.png, etc. in sequence. -vcodec copy losslessly stores the images in a video stream. The resulting video is playable in vlc or totem.

Since the image data is just copied, this will be very fast and of course lossless.

(See "How do I encode single pictures into movies?" in ffmpeg's docs.)

Comments

[Rustam]

if (BuildConfig.DEBUG) { // do something for a debug build }

[HelloCW]

Thanks! Do you think that Altoyr's way is always OK ?

[John Thur]

@HelloCw yes, if you need to customize your own flag, that's a good example. But if you want to use this in library project, you may need some other workaround because there is a bug of android gradle plugin mentioned in my reply.

[HelloCW]

Thanks, do you mean that I maybe also meet bugs even if I use Altoyr's code?

[HelloCW]

Do you mean that I also maybe meet bugs even if I use Altoyr's code?